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October 2006
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2006.10.21 23:10 "Re: Modify XMP", by Phil Harvey
Chris wrote: > XMP blocks includes a small buffer space for in place modifications > If your > changes fit in that space, you can modify the XMP data without > disturbing > the rest of the file. This is true. The XMP specification recommends a few kB worth of blank lines, which can be used in a TIFF file since there is no checksum done. > If your modifications donšt fit in that space, you would have to read > and > rewrite the TIFF, or use a TIFF specific modification to move the XMP > block > to the end of the file while leaving everything else in place (and an > unused > space where the old XMP block was). This is one of the tricks. However, it isn't 100% foolproof since it may result in the loss of information in certain types of trailers (ie. AFCP) which may be appended to the end of a TIFF file. - Phil